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OK.. I think your 'two notches' refer to indentations or 'notches' along the seam of the snorkel? I have a second original air cleaner (fllat borttom) so I checked that unit tonight. The seam is along the front side of the snorkel(towards the front of the car), and about halfway along the seam is a little 'notch' in the seam (only one notch)... The snorkel is right at 11" long (from the back curved edges to the tip), has an inlet of 1.5" ID, and the curved outer lip of 2-3/8" in Dia.. At the point where it connects to the base, it is an oval slightly more than 4" in width, and close to 2" in height.

Is the vent tube for the bottom of a cowl AC available in any form? In examining a spare cowl AC I purchased 35 yrs ago, I jsut noticed that the vent tube is missing. (The extension is missing also, but I remember giving that to a Z-28 friend in the late '70 who needed it (He bought GM OTC cowl air cleaner, but the 302 extension had been discontinued by GM). Will a repro extension fit an original air cleaner?